Visible blood vessels in the arm area generally refer to veins. Venous blood vessels with raised bumps may be associated with factors such as venous sinus and varicose veins. 1. Venous sinus is a normal structure of the venous blood vessels, which generally refers to the dilated area of the venous blood vessels, a device that prevents the backflow of blood and an important structure that maintains smooth blood circulation in the body. 2. Varicose veins are irregularly bulging, twisted and dilated veins due to localized elevated pressure in the venous vessels. Varicose veins of the upper extremities are rare, and may be caused by thrombosis of the upper extremities or obstruction of venous return by compression of the upper extremities. It is necessary to search for the cause of the disease, and to carry out targeted treatment according to the cause of the disease in order to alleviate the symptoms. Since clinical manifestations may vary, a doctor’s consultation is required to determine the cause.